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عمران::
سرریز جت ازاد
Different names are used by authors and designers in various countries to describe structures that employ hydraulic action of jet trajectory to accomplish energy dissipation; ski jump bucket, flip bucket, trajectory bucket, free jet spillways, and free over-falls.
However, in the opinion of the author, the term trajectory bucket covers all these structures, which could be further classified as ski jump buckets, flip buckets, and free jet spillways.
In a free jet spillway, the high velocity jet leaves from either a short crested spillway at the top of an arch dam or a deep seated short length bottom outlet, with its exit shaped in the form of a deflector, as shown in Figure 3.
In a free jet spillway, the jet is subjected to air resistance and air entrainment whereby a significant portion of its energy is dissipated before it plunges into the tail water.
The behavior of the jet in the free jet spillways and ski jump buckets is more akin to a three dimensional jet, that in the flip buckets the resemblance is more to a two dimensional jet.
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